Why does plus have two ses but minus only one when plural?  
Likely different languages of origin (too lazy to look it up), although doubled consonants are always problematic.  I went back and forth with "modeling" the other day.  Brits and Canucks write  it as "modelling."
Preps:
- Increase water storage ($9 Aqua-Tainers at Wally World!)
- Add a rain barrel to the gutters as a trial.  If it works well, add at least one more.
- Start using more wheat and beans in everyday cooking (hand grinder is on the way).
- Try new sourdough recipes.
- Buy more ammo.  Get to range.
- More dog food.
Longer term:
- Add a generator and hard-wired switch for a few critical circuits.